The UN ambassador, 52, is a qualified psychologist and television presenter who visits schools around the world as part of her work with the United Nations Population Fund.

She said in Belgium parents are much more liberal in their approach to sex.

But does that mean parents should be more liberal? Annie O’Leary, Editor in Chief of Netmums, said while conversations should be open, the choice on what you discuss with your children should be exactly that - a choice.

She told HuffPost UK Parents: "How the subject of sex education is tackled at home is up to individual families, though most Netmums would agree that the top priorities in any discussion on the subject should be making it age appropriate, and in such a way that it invites children to feel free to ask any questions they may have.

"Equally, while it’s certainly a novel idea to introduce Bob and Wendy’s sex life to children at such a young age, the basic principle of talking about healthy relationships with children, and giving them easily identifiable examples of what healthy relationships look like, has been welcomed."

What are your thoughts - should Bob The Builder spark a conversation about sex?